Candidates after completing MBBS appear for NEET-PG  for there further higher education in a specialised field of medicine.You require minimum of 50% in MBBS  to get admission in postgraduate courses.After persuing PG you will practice your specialty,you will have all the job satisfaction clinically,you will have all the perks of central government and you will be posted only in metro cities with specialist post opening (Delhi, Banglore, Hydreabad..)This specialist post is available in medicine,surgery,gynec, dermatology and few other branches.Starting salary would be 1 lakh.In Morden era,the clinicals (post-MD/MS/DNB/MCH/DM) are earning high salary and immense respect from society.They carry an aura of greatness around them.Where as candidate who are going for UPSC-CMS gets the position like Junior scale posts in central health services,General duty medical officer in New Delhi municipal council, assistant divisional medical officer in Indian ordnance factories health service, assistant divisional medical officer in railway,medical officer in municipal corporation of delhi.By persuing UPSC-CMS,you will get early settlement,class 1 officer position,a very good administrative position in public health,9-5 job,but it will be non clinical job.So if your not interested in clinical practice,more knee in an administrative role,willing to settle early and want a secured government job u can consider UPSC-CMS and if you want to study further to become specialist you can persue NEET PG.